Feed-screw motor for rock drills



1,637186 July 26,1927. c c. HANSEN FEED SCREW MOTQR FOR ROCK DRILLS I Filed Jan. 19. 1926 2 Sheets-Sheet 1 INVENTOR 1103 1056 1 andaa 7 BY I ll 1 msuro EYI July 26,1927. 6 7,186

C. C. HANSEN FEED SCREW MOTOR FOR ROCK DRILLS IN VEN TOR fia lesC- use/z BY 2 2 .575 A?" RNEY Patented July 26, 1927.

UNITED STATES PATENT OFFICE.

CHARLES C. HANSEN, OF EASTON, PENNSYLVANIA, ASSIGNOR TO INGERSOLL-RAND COMPANY, OEJERSEY CITY, NEW JERSEY, A OORIfORATION OF NEW JERSEY.

FEED-SCREW MOTOR FOR ROCK DRILLS.

Application filed January 19, 1926. Serial No. 82,272.

- This invention relates to rock drills, but more particularly to a device forpi'oducing relative movement between a rock drill and its supporting shell.

The objects of the invent-ion are to enable a rock drill to be quickly withdrawn from the work, to increase the efficiency of the drifter and other similar types of rock drills supported and guided by shells, and to eliminate the slow and arduous method of rotating the feed screw by hand.

The invention consists of the combination of elements and arrangement of parts substantially as hereinafter described and more.

particularly pointed out in the appended claims and illustrated in the accompanying drawings, in which I Figure 1 is an elevation, partly in section, of arock drill and its shell-equipped with a motor connected to rotate the feed screw,

Figure 2 is a perspective view, partly 1n section, of the motor casing,

Figure 3 is a transverse section taken through Figure 1 on the line 33 looking in the direction of the arrows, and

Figure 4 is a view similar to Figure 1 showmg the motor mounted coaxially with the feed screw.

Referring to the drawings, and at first more particularly to Figure 1, the invention is shown applied to a rock drill A supported and guided by a shell B in the usual manner. The rock drill A accordingly has guides C formed on opposite sides thereof to cooperate slidably with suitable guideways (not shown) formed in the shell B.

In order to produce relative longitudinal movement betweenthe rock drill illustrated and its shell, it is the usual practice to employ a feed screw of any suitable type. The feed screw thus employed is usually anchored at one end in the shell in such a manner that it is permitted to rotate freely but is held against longitudinal movement.

Accordingly in this instance a feed screw D extends through the shell B in the manner described and engages a feed nut E carried by the rock drill A.

By means of this construction, the rock drill may be advanced to the work or with drawn therefrom, depending upon the direction in which the feed screw D is being rotated. y

In accordance with the present invention,

extending transversely through the gear H and the end F of the feed screw D. V

In order to support the, bearing bracket G at a distance sufficiently to the rearward end of the shell B to prevent interference between said bearing bracket and the-rock drill A as the rock drill is moved to its rearward limiting position, a pair of rods K, only one of which is shown in side view in the figures, are supported by the rearward end of the shell B and on opposite sides thereof to support at their free ends the bearing bracket G. The rods K' may be in the form of tie-rods and are threaded at their ends to receive nuts L.

Usually in rock drills of the type illustrated, a crank or other suitable means is secured to the feed screw whereby the operator may rotate said feed screw, both for feeding the drill into the rock and also for withdrawing the drill from the work after the drilling operation is completed. During the drilling operation the forward movement of the drill is of necessity slow since such movement is dependent upon the penetration of the drill steel into the work. After the cut is completed, however, it is desirable to withdraw the drill in the shortest time possible so'thatthe drill'steel may be changed with the minimum loss of time. In the method of manipulating the feed screw heretofore employed, such withdrawal of the drill. requires considerable time and, in consequence, reduces the drilling efliciency considerably. To the end that such changes of the steel may be made quickly and the drilling may expedited, a motor designated generally by O is mounted at the rearward end of the shell B. A casing P of the motor O in this instance has a pair of lugs Q which extend at an angle to said casing and are provided with apertures R through which the rods K may extend for supporting the motor. The motor 0 is preferabl clamped in position by a pair of spacers g on the rods K and interposed between the lugs Q, of the motor and the bearing bracket G, thus serving both as a means for clamping the motor in position and as an abutment for the bearing bracket.

The motor 0 in this instance comprises a chamber T formed on one side of the casing P and in which chamber are arranged the gears U and V which comprise the power element of the motor. The gear V in this instance carries a worm W rotatable in a gear casing X forming a art of the casing P and the rearward ortion thereof. The

worm W is preferaby formed integrallywith the shaft Y whereby said worm is connected to the gear V and meshes with a worm wheel Z arranged freely rotatable on the shaft 6. One end of the shaft 6 may be supported in the casing P in any suitable manner and is su ported at its other end by the bearing bracket G. The rearward end of the shaft 6, like the corresponding end of the feed screw D, is also preferably provided with a square portion F to receive a bevel gear 0 which meshes with the gear H carried by the feed screw D. Disposed near the front end of the shaft b is a clutch of any suitable type, shown in this instance as a jaw clutch having a clutch collar d slidable on the forward squared end of the shaft 6 and thus held against rotation with respect thereto. A clutch yoke e pivoted at one end as at f engages the clutch collar d in the usual manner and is provided with a handle 9 whereby the clutch" collar having jaws may be actuated into engagement with a clutci member h having cooperating jaws and carried by the worm wheel Z.

In order that the clutch collar d may be automatically disconnected from the clutch member h when manual pressure on the handie 9 is released, a retracting spring 7' is secured at one end to the clutch yoke 6 between the pivot f and the clutch collar (1 and is anchored at its other end to a projection is preferably formed integrally with a cover 0 secured to the end of the gear casing X.

To the end that the feed screw D may be manually rotated for advancing the rock drill to the work, a crank p is secured to the front end of the shaft 6 to abut the end of the cover 0 and thus prevent rearward movement of the shaft 6.

The motor 0 is in this instance illustrated as a one direction motor and ressure fluid supplied to a throttle valve q t irough a supply line 1' may be admitted through a passage 25 leading from the throttle valve to the motor. Suitable exhaust ports u are conveniently formed in the motor casing for exhausting the pressure fluid to the atmosphere.

The operation of the device is as follows: With the drill in the position shown in Figure 1, or in other words, its rearward limiting position with respect to the shell B, the

drill A may be set in operation and as the drill steel penetrates the rock, the operator may, by rotating the crank p, impart rotary movement to the feed screw D and thus advance the drill in accordance with the penetration of the drill steel into the rock. After the drill steel has penetrated the rock to the limit of its length, and it is desired to withdraw the same from the work, the clutch collar d may be actuated by the handle 9 into en agement with the clutch member it carried y the worm wheel Z. Pressure fluid may then be admitted to set the motor in operation. With the clutch members in engagement, rotation of the motor will be transmitted through the shaft b to rotate the feed screw rapidly in the direction required for imparting retrograde movement to the drill with respect to the shell.

In the modification shown in Figure 4, a motor 0, similar in all essential respects to the motor described in connection with the preferred modification, is shown mounted on the rearward ends of the rods K. The motor casing P in this instance is provided with lugs '0 at its forward end to abutthe rearward ends of the spacers S and to receive the rearward ends of the rods K. In this instance the motor 0 is so arranged that the worm gear Z is coaxial with the feed screw D and is arranged rotatably on an extension a; formed on the rearward end of the feed screw D. The clutch collar d in this instance is arranged on the squared rearward end of the extension to as is also the crank p. It will be seen that in this modification, the motor 0 is connected directly to the feed screw D, thus forming a combination which is particularly advantageous for use in short hole drilling.

I claim:

1. The combination of a rock drill a shell therefore, a feed screw rotatable in the shell and operativel connected to the rock drill, rods supporte by the shell and extending rearwardly thereof, a bearing bracket on the free end of the rods to support one end of the feed screw, a rotary motor, a motor bracket supported by the rods, a shaft adapted to be rotated by the motor and supported at one end by the bearin bracket, and gears on corresponding ends 0 the feed screw and the shaft meshing with each other to transmit the rotary movement of the motor to the feed screw for imparting retrograde movenlilenlt to the rock drill with respect to the s el 2. The combination with a rock drill, a shell therefore, a feed screw rotatable in the shell and operatively connected to the rock drill, of a gear carried by one end of the feed screw, a rotary motor secured to the shell, said motor comprising a pair of fluid actuated gears, a worm carried by one of the gears, a worm wheel meshing with the worm and carrying a clutch member, a shaft extending rotatably through the worm wheel and forming a bearing therefore, a gear on one end of the shaft meshing with the gear on the feed screw for transmitting rotary movement of the motor to the feed screw, a clutch collar slidable on the shaft to cooperate with the clutch member for preventing relative movement between the worm wheel and the shaft, a sprin for automaticall 10 releasing the clutch col ar from the clutc member, and a crank on the shaft for manually rotating the feed screw.

In testimony whereof I have signed this specification.

CHARLES C. HANSEN. 

